Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b58a62d9389e09…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79be31464856ad936478d1626838a70a SHA-1: 19cdf225e18688d7d91fa55b59c80ff54c60c250 SHA-256: 43b58a62d9389e095173252b5c0118d7445541bce84780c4d38a295ffd570279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and compromised CMS upload links indicates a clear intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=meaning+of+yack
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef025f11ea---zinamapinug.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d72d694537399b25955ee93184360d8c/feragudezofategodefalog.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6a4f705ba---lubenuzatuvesonajaku.pdf
    • http://maksimetall.ru/files/gebokimexetobip.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e8af3beca5f4bb339f2539461a9e10/12797737231.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d25660750---dojopa.pdf
    • https://cmfnepal.org/userfiles/files/2878177643.pdf
    • http://odpadykj.cz/UserFiles/File/merelojivaxirav.pdf
    • http://lucann.com/Upload/file/76934543521.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14299757519.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/gefomitetilimorabug.pdf
    • https://0900107678.com/upload/file/14472329018.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/puxufib.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8eeb32f88---xaxase.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602073729.pdf
    • https://ludifrance.fr/userfiles/file/10306539903.pdf
    • http://www.firengo.com/userfiles/files/32381784099.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/183m866pdu4gk5ln70524nc2dg/dotoxexet.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbce43321d7---80779137033.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089789ca6247---pefuzukujosilu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735684a421---78582312491.pdf
    • http://apcmagon.com/userfiles/kokabuvononizavuwopevag.pdf
    • http://www.zywawiara.pl/pliki/9247607560.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dced442ac---ziwix.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/97689192862.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e517.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16792 bytes
font_01_sfnt_off0000fd2e.bin
61585c837a7a6953483e5599d0e1dfdfc50ceedd763a64827b4e0adbed3a3732
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10296 bytes
font_02_sfnt_off00011485.bin
5a1369ceca65cf7d60ddc6f8337d64ee96f5f5d54b848d91cab2184350436909
pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 19000 bytes